Any of them because there is no set size for any of them. All of them are classified by different things and none of them are size. A moon orbits a planet, a planet orbits a star in a slightly elliptical orbit, a comet orbits a star in a highly elliptical orbit, and an asteroid is a planet or moon (any celestial object really) that is out of orbit and is flying through the universe a high speeds. For instance, a moon can be bigger than a planet.
its the comets are smaller than planets, moons, and asteroids. In order of size, usually comets < asteroids < moons < planets
Comets
Planets, asteroids, meteors, comets, moons (which are also in orbit around their respective planets), dust particles, interplanetary gas.
the asteroid belt, the kuiper belt, and the oort cloud.
All of the planets and that includes (asteroids, meteoroids, comets, moons, dwarf planets.)
Asteroids and Comets
its the comets are smaller than planets, moons, and asteroids. In order of size, usually comets < asteroids < moons < planets
Comets
Stars, planets, moons, comets, asteroids and other phenomena.
No. Neither do any of their moons, and neither do any comets or asteroids.
The Sun, planets, moons, planetoids, asteroids, dust, gas, comets.
All of our 8 planets & their moons, asteroids, meteors, comets etc.
There are asteroids, meteoroids and comets.
Because the sun is not a planet. In simple terms, moons are to planets as asteroids, comets, and planets are to the sun.
Basically absence... also comets, meteors, asteroids, planets, moons, satellites, shuttles and space stations, planets and moons.
the asteroid belt, the kuiper belt, and the oort cloud.
Planets, asteroids, meteors, comets, moons (which are also in orbit around their respective planets), dust particles, interplanetary gas.